Alternating Conjugated Electron Donor鈥揂cceptor Polymers Entailing Pechmann Dye Framework as the Electron Acceptor Moieties for High Performance Organic Semiconductors with Tunable Characteristics

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• 作者：Zhengxu Cai ; Hewei Luo ; Penglin Qi ; Jianguo Wang ; Guanxin Zhang ; Zitong Liu ; Deqing Zhang
• 刊名：Macromolecules
• 出版年：2014
• 出版时间：May 13, 2014
• 年：2014
• 卷：47
• 期：9
• 页码：2899-2906
• 全文大小：467K
• 年卷期：v.47,no.9(May 13, 2014)
• ISSN：1520-5835

文摘

In this paper, we report the design, synthesis and semiconducting behavior of two conjugated D鈥揂 polymers P-BPDTT and P-BPDBT which entail BPD, a Pechmann dye framework, as electron accepting moieties, and thieno[3,2-b]thiophene and 2,2鈥?bithiophene as electron donating moieties. Their HOMO/LUMO energies and bandgaps were estimated based on the respective cyclic voltammgrams and absorption spectra of thin films. P-BPDTT possesses lower LUMO level and narrower bandgap than P-BPDBT. On the basis of the characterization of the field-effect transistors, a thin film of P-BPDTT exhibits ambipolar semiconducting properties with hole and electron mobilities reaching 1.24 cm² V^鈥? s^鈥? and 0.82 cm² V^鈥? s^鈥?, respectively, after thermal annealing. In comparison, thin film of P-BPDBT only shows p-type semiconducting behavior with hole mobility up to 1.37 cm² V^鈥? s^鈥?. AFM and XRD studies were presented to understand the interchain arrangements on the substrates and the variation of carrier mobilities.